Bellows mechanical seal device

Abstract

The utility model discloses a bellows mechanical sealing device, including moving ring subassembly, still including support subassembly, fixedly connected in moving ring subassembly, elastic component, fixedly connected in support subassembly, pipe end subassembly, fixedly connected in elastic component, static end subassembly, slidingly connected in pipe end subassembly, moving ring subassembly includes dynamic ring, still including the through -hole of being set up on dynamic ring, the ring shoulder of setting at the end of dynamic ring, the radial rubber ring of fixedly connected at the end of dynamic ring, the utility model discloses through setting up through -hole and fixed hole intercommunication on dynamic ring, radial hole and fastening hole intercommunication, use screw fixed connection after, dynamic ring and metal bellows form a whole, and dynamic ring fixedly connected on the pivot provides the supporting force simultaneously, make metal bellows closely cooperate in the slot, and through liquid hole replenish liquid and carry out sealing, and metal bellows provides elastic supporting force and makes dynamic block and static block form friction pair, produces dynamic sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically a bellows mechanical seal device. Background Technology

[0002] A mechanical seal is a shaft sealing device that prevents fluid leakage by maintaining contact and relative sliding between at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure and the elastic force of a compensation mechanism. A metal bellows mechanical seal is based on a traditional mechanical seal and uses a metal bellows as an elastic element and auxiliary sealing component. It compensates for the wear and displacement of the sealing surface through its elastic deformation, thereby achieving a high-efficiency seal. This type of seal is widely used in high-temperature, high-pressure, or corrosive media environments such as petrochemical, power, and metallurgy industries, and can effectively reduce leakage points and improve the reliability of equipment operation.

[0003] In the long-term use of existing metal bellows mechanical seals, although wear-resistant materials (such as hard alloys or graphite) are often used for the friction pairs to extend service life, their elastic elements generally rely on ordinary springs to provide initial sealing force. Such springs are prone to failure due to corrosion of the contact surface with the moving shaft, resulting in untimely or even complete loss of elastic force transmission, which in turn leads to separation of the sealing end face and the formation of gaps. In addition, corrosive media may penetrate into the interior of the spring, further accelerating its fatigue fracture, ultimately causing a decrease in sealing performance or media leakage, affecting the safe operation of equipment and increasing maintenance costs.

[0004] In the prior art, a Chinese utility model patent discloses a bellows mechanical seal (publication number: CN222950417U), which discloses a bellows section at the center of the upper end of the connecting base plate, a fixed ring at the upper end of the bellows section, and multiple evenly distributed clamping plates arranged radially around the top of the fixed ring. The upper inner side of the clamping plate has a sliding groove, and a pin block is matched and retractable inside the sliding groove. A spring is also provided inside the sliding groove, with one end connected to the pin block and the other end fixed to the inner end of the sliding groove. The outer end of the pin block has a first magnetic block. A movable ring is also matched with the fixed ring. Multiple clamping grooves are arranged around the periphery of the movable ring, which are perpendicular to the clamping plates. The prior art allows the rubber ring to be quickly replaced through the sliding groove, pin block and other structures. However, when facing corrosive shaft end sealing conditions, corrosion is prone to occur between the spring and the moving shaft, resulting in insufficient spring support force, causing the seal to loosen and fail. If the overall replacement cost is too high, the sealing effect can be maintained by replacing the elastic component. Utility Model Content

[0005] This invention provides a bellows mechanical seal device, which aims to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a bellows mechanical seal device, including a moving coil assembly, a support assembly fixedly connected to the moving coil assembly; an elastic assembly fixedly connected to the support assembly; a pipe end assembly fixedly connected to the elastic assembly; and a stationary end assembly slidably connected to the pipe end assembly.

[0007] The moving ring assembly includes a moving ring, a through hole formed on the moving ring, a set screw rotatably connected to the moving ring, a pre-sealing rubber ring fixedly connected to the moving ring, a ring shoulder set at the end of the moving ring, an axial rubber ring fixedly connected to the ring shoulder, and a radial rubber ring fixedly connected to the end of the moving ring.

[0008] As a further optimization, the support assembly includes a bracket sleeved on the shoulder, a limiting surface disposed on the bracket, an axial groove formed on the bracket, a radial groove formed on the bracket, a fixing hole formed on the bracket, and a radial hole formed on the bracket.

[0009] As a further optimization, the elastic component includes a limiting block sleeved on the shoulder, a fastening hole opened on the limiting block, a metal bellows fixedly connected to the limiting block, and a pipe head provided at the end of the metal bellows.

[0010] As a further optimization, the pipe end assembly includes a jacketed rubber ring slidably connected to the pipe head, a plug fixedly connected to the jacketed rubber ring, a groove formed on the plug, a liquid hole formed on the plug, a flange provided on the plug, and a positioning hole formed on the flange.

[0011] As a further optimization, the pipe end assembly includes an end ring fixedly connected to the flange, a guide hole opened on the end ring, and a moving block tightly fitted on the end ring.

[0012] As a further optimization, the stationary end assembly includes a stationary block that fits tightly onto the moving block, and a stationary ring that is fixedly connected to the stationary block.

[0013] As a further optimization, the limiting block is tightly fitted with the limiting surface, and the fastening hole and the radial hole are coaxial.

[0014] As a further optimization, the guide hole is coaxial with and connected to the liquid hole, and the other end of the guide hole is connected to the contact surface of the moving block and the end ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. By opening a through hole on the rotating ring and connecting it to the fixed hole, and by connecting the radial hole to the fastening hole, the rotating ring and the metal bellows are fixedly connected with screws to form a whole. At the same time, the rotating ring is fixedly connected to the rotating shaft to provide support force, so that the metal bellows fits tightly in the groove. Liquid is added through the liquid hole for sealing. The metal bellows provides elastic support force so that the moving block and the stationary block form a friction pair, producing a dynamic sealing effect.

[0017] 2. The moving ring and the metal bellows are fixedly connected. When the metal bellows needs to be replaced, the moving ring and the metal bellows can be removed by loosening the set screw. The moving ring and the metal bellows can be replaced as a whole or the metal bellows can be replaced separately as needed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view for practical use;

[0020] Figure 3 This is a partial sectional view of the moving coil assembly used in this application;

[0021] Figure 4 for Figure 3 Another perspective view;

[0022] Figure 5 This is a half-sectional view of the support components for this utility model;

[0023] Figure 6 For practical purposes Figure 5 Another perspective view;

[0024] Figure 7 This is a partial sectional view of the elastic component of this utility model;

[0025] Figure 8 This is a half-sectional view of the pipe end assembly and stationary end assembly of this utility model;

[0026] Figure 9 This is a partial view of the pipe end assembly of this utility model.

[0027] In the diagram: 1. Moving ring assembly; 11. Moving ring; 12. Through hole; 13. Set screw; 14. Initial sealing ring; 15. Ring shoulder; 16. Axial ring; 17. Radial ring; 2. Support assembly; 21. Bracket; 22. Limiting surface; 23. Axial groove; 24. Radial groove; 25. Fixing hole; 26. Radial hole; 3. Elastic assembly; 31. Limiting block; 32. Fastening hole; 33. Metal bellows; 34. Pipe head; 4. Pipe end assembly; 41. Jacketed ring; 42. Plug; 43. Gap; 44. Liquid hole; 45. Flange; 46. Positioning hole; 47. End ring; 48. Guide hole; 49. Moving block; 5. Stationary end assembly; 51. Stationary block; 52. Stationary ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This utility model provides a bellows mechanical seal device, such as Figures 1 to 9 As shown, the assembly includes a moving coil assembly 1, a support assembly 2 fixedly connected to the moving coil assembly 1, an elastic assembly 3 fixedly connected to the support assembly 2, a tube end assembly 4 fixedly connected to the elastic assembly 3, and a stationary end assembly 5 slidably connected to the tube end assembly 4.

[0030] The moving ring assembly 1 includes a moving ring 11, a through hole 12 formed on the moving ring 11, a set screw 13 rotatably connected to the moving ring 11, a pre-sealing rubber ring 14 fixedly connected to the moving ring 11, a ring shoulder 15 disposed at the end of the moving ring 11, an axial rubber ring 16 fixedly connected to the ring shoulder 15, and a radial rubber ring 17 fixedly connected to the end of the moving ring 11.

[0031] The support assembly 2 includes a bracket 21 sleeved on the shoulder 15, a limiting surface 22 provided on the bracket 21, an axial groove 23 formed on the bracket 21, a radial groove 24 formed on the bracket 21, a fixing hole 25 formed on the bracket 21, and a radial hole 26 formed on the bracket 21.

[0032] The elastic component 3 includes a limiting block 31 sleeved on the shoulder 15, a fastening hole 32 opened on the limiting block 31, a metal bellows 33 fixedly connected to the limiting block 31, and a tube head 34 provided at the end of the metal bellows 33.

[0033] The pipe end assembly 4 includes a jacketed rubber ring 41 slidably connected to the pipe head 34, a plug 42 fixedly connected to the jacketed rubber ring 41, a groove 43 formed on the plug 42, a liquid hole 44 formed on the plug 42, a flange 45 provided on the plug 42, and a positioning hole 46 formed on the flange 45.

[0034] The pipe end assembly 4 includes an end ring 47 fixedly connected to the flange 45, a guide hole 48 opened on the end ring 47, and a moving block 49 tightly fitted on the end ring 47.

[0035] The stationary end assembly 5 includes a stationary block 51 that is tightly fitted onto the moving block 49, and a stationary ring 52 that is fixedly connected to the stationary block 51.

[0036] The limiting block 31 is tightly fitted with the limiting surface 22, and the fastening hole 32 is coaxial with the radial hole 26.

[0037] The guide hole 48 is coaxial with and connected to the liquid hole 44, and the other end of the guide hole 48 is connected to the contact surface of the moving block 49 and the end ring 47.

[0038] Specifically, the rotating ring 11 is fixedly connected to the rotating shaft by the set screw 13. The through hole 12 and the fixing hole 25 on the rotating ring 11 are connected and fixedly connected by screws. The initial sealing rubber ring 14 on the rotating ring 11 seals the inner side of the rotating ring 11 with the shaft surface of the rotating shaft. The ring shoulder 15 is used to fix the support assembly 2 and the elastic assembly 3. The axial rubber ring 16 seals between the axial groove 23 of the bracket 21 and the ring shoulder 15. The radial rubber ring 17 seals between the radial groove 24 of the bracket 21 and the rotating ring 11. The limiting surface 22 is used to limit the limiting block 31 and is fixedly connected through the radial hole 26 and the fastening hole 32. At this time, the metal bellows 33 and the rotating ring 11 are fixedly connected.

[0039] The pipe head 34 is inserted into the clamping groove 43 and sealed by the interlayer rubber ring 41. The plug 42 and the clamping groove 43 are used to bear the supporting force from the metal bellows 33. The liquid hole 44 and the guide hole 48 are coaxial and connected. The other end of the guide hole 48 is connected to the contact surface of the moving block 49 and the end ring 47. The liquid from the contact surface of the moving block 49 and the end ring 47 enters the clamping groove 43 through the guide hole 48 and the liquid hole 44, and is sealed with the interlayer rubber ring 41. The moving block 49 and the stationary block 51 form a friction pair to achieve dynamic sealing.

[0040] The pipe end assembly 4 is fixedly connected via the positioning hole 46 and the end ring 47 on the flange 45.

[0041] With the above connection, when the metal bellows 33 needs to be replaced, simply loosen the set screw 13 to pull out the metal bellows 33 and the moving ring 11. Then, replace the metal bellows 33 or the moving ring 11 and the metal bellows 33 as a whole as needed.

[0042] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A bellows mechanical seal device, comprising a moving coil assembly (1), characterized in that: It also includes a support component (2), which is fixedly connected to the moving coil component (1); an elastic component (3), which is fixedly connected to the support component (2); a tube end component (4), which is fixedly connected to the elastic component (3); and a stationary end component (5), which is slidably connected to the tube end component (4). The moving ring assembly (1) includes a moving ring (11), a through hole (12) opened on the moving ring (11), a set screw (13) rotatably connected to the moving ring (11), a pre-sealing rubber ring (14) fixedly connected to the moving ring (11), a ring shoulder (15) provided at the end of the moving ring (11), an axial rubber ring (16) fixedly connected to the ring shoulder (15), and a radial rubber ring (17) fixedly connected to the end of the moving ring (11).

2. The bellows mechanical seal device according to claim 1, characterized in that: The support assembly (2) includes a bracket (21) sleeved on the shoulder (15), a limiting surface (22) provided on the bracket (21), an axial groove (23) opened on the bracket (21), a radial groove (24) opened on the bracket (21), a fixing hole (25) opened on the bracket (21), and a radial hole (26) opened on the bracket (21).

3. The bellows mechanical seal device according to claim 2, characterized in that: The elastic component (3) includes a limiting block (31) sleeved on the shoulder (15), a fastening hole (32) opened on the limiting block (31), a metal bellows (33) fixedly connected to the limiting block (31), and a tube head (34) provided at the end of the metal bellows (33).

4. The bellows mechanical seal device according to claim 3, characterized in that: The pipe end assembly (4) includes a jacketed rubber ring (41) slidably connected to the pipe head (34), a plug (42) fixedly connected to the jacketed rubber ring (41), a groove (43) opened on the plug (42), a liquid hole (44) opened on the plug (42), a flange (45) provided on the plug (42), and a positioning hole (46) opened on the flange (45).

5. A bellows mechanical seal device according to claim 4, characterized in that: The pipe end assembly (4) includes an end ring (47) fixedly connected to the flange (45), a guide hole (48) opened on the end ring (47), and a moving block (49) tightly fitted on the end ring (47).

6. The bellows mechanical seal device according to claim 5, characterized in that: The stationary end assembly (5) includes a stationary block (51) that fits tightly on the moving block (49) and a stationary ring (52) that is fixedly connected to the stationary block (51).

7. A bellows mechanical seal device according to claim 6, characterized in that: The limiting block (31) fits tightly with the limiting surface (22), and the fastening hole (32) is coaxial with the radial hole (26).

8. A bellows mechanical seal device according to claim 7, characterized in that: The guide hole (48) is coaxial with and connected to the liquid hole (44), and the other end of the guide hole (48) is connected to the contact surface of the moving block (49) and the end ring (47).

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